mountain gorilla

Hi there, Some time ago I came across a thread talking about the mountain gorillas briefly kept by Zoo Antwerp, they only stayed briefly there and died shortly after arriving. Why is this subspecies so unfit for captivity, unlike the other ones?

Project S.O.S Gorilla: S.O.S Gorilla - The Gorilla support internet project S.O.S Gorilla is a project created to raise funds to help the endangered mountain gorillas, which has received the official support from the Barcelona Zoo, EEP Gorillas, and the ONU Year Of The Gorilla 2009. It...